PipedReader

public class PipedReader
extends Reader

java.lang.Object
   ↳ java.io.Reader
     ↳ java.io.PipedReader


Piped character-input streams.

Summary

Inherited fields

protected Object lock

The object used to synchronize operations on this stream.

Public constructors

PipedReader()

Creates a PipedReader so that it is not yet connected.

PipedReader(int pipeSize)

Creates a PipedReader so that it is not yet connected and uses the specified pipe size for the pipe's buffer.

PipedReader(PipedWriter src)

Creates a PipedReader so that it is connected to the piped writer src.

PipedReader(PipedWriter src, int pipeSize)

Creates a PipedReader so that it is connected to the piped writer src and uses the specified pipe size for the pipe's buffer.

Public methods

void close()

Closes this piped stream and releases any system resources associated with the stream.

void connect(PipedWriter src)

Causes this piped reader to be connected to the piped writer src.

int read()

Reads the next character of data from this piped stream.

int read(char[] cbuf, int off, int len)

Reads up to len characters of data from this piped stream into an array of characters.

boolean ready()

Tell whether this stream is ready to be read.

Inherited methods

abstract void close()

Closes the stream and releases any system resources associated with it.

void mark(int readAheadLimit)

Marks the present position in the stream.

boolean markSupported()

Tells whether this stream supports the mark() operation.

static Reader nullReader()

Returns a new Reader that reads no characters.

int read()

Reads a single character.

abstract int read(char[] cbuf, int off, int len)

Reads characters into a portion of an array.

int read(char[] cbuf)

Reads characters into an array.

int read(CharBuffer target)

Attempts to read characters into the specified character buffer.

boolean ready()

Tells whether this stream is ready to be read.

void reset()

Resets the stream.

long skip(long n)

Skips characters.

long transferTo(Writer out)

Reads all characters from this reader and writes the characters to the given writer in the order that they are read.

Object clone()

Creates and returns a copy of this object.

boolean equals(Object obj)

Indicates whether some other object is "equal to" this one.

void finalize()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

final Class<?> getClass()

Returns the runtime class of this Object.

int hashCode()

Returns a hash code value for the object.

final void notify()

Wakes up a single thread that is waiting on this object's monitor.

final void notifyAll()

Wakes up all threads that are waiting on this object's monitor.

String toString()

Returns a string representation of the object.

final void wait(long timeoutMillis, int nanos)

Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

final void wait(long timeoutMillis)

Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

final void wait()

Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

abstract void close()

Closes this stream and releases any system resources associated with it.

abstract int read(CharBuffer cb)

Attempts to read characters into the specified character buffer.

abstract void close()

Closes this resource, relinquishing any underlying resources.

Public constructors

PipedReader

Added in API level 1
public PipedReader ()

Creates a PipedReader so that it is not yet connected. It must be connected to a PipedWriter before being used.

PipedReader

Added in API level 9
public PipedReader (int pipeSize)

Creates a PipedReader so that it is not yet connected and uses the specified pipe size for the pipe's buffer. It must be connected to a PipedWriter before being used.

Parameters
pipeSize int: the size of the pipe's buffer.

Throws
IllegalArgumentException if pipeSize <= 0.

PipedReader

Added in API level 1
public PipedReader (PipedWriter src)

Creates a PipedReader so that it is connected to the piped writer src. Data written to src will then be available as input from this stream.

Parameters
src PipedWriter: the stream to connect to.

Throws
IOException if an I/O error occurs.

PipedReader

Added in API level 9
public PipedReader (PipedWriter src, 
                int pipeSize)

Creates a PipedReader so that it is connected to the piped writer src and uses the specified pipe size for the pipe's buffer. Data written to src will then be available as input from this stream.

Parameters
src PipedWriter: the stream to connect to.

pipeSize int: the size of the pipe's buffer.

Throws
IOException if an I/O error occurs.
IllegalArgumentException if pipeSize <= 0.

Public methods

close

Added in API level 1
public void close ()

Closes this piped stream and releases any system resources associated with the stream.

Throws
IOException if an I/O error occurs.

connect

Added in API level 1
public void connect (PipedWriter src)

Causes this piped reader to be connected to the piped writer src. If this object is already connected to some other piped writer, an IOException is thrown.

If src is an unconnected piped writer and snk is an unconnected piped reader, they may be connected by either the call:

snk.connect(src) 

or the call:

src.connect(snk) 

The two calls have the same effect.

Parameters
src PipedWriter: The piped writer to connect to.

Throws
IOException if an I/O error occurs.

read

Added in API level 1
public int read ()

Reads the next character of data from this piped stream. If no character is available because the end of the stream has been reached, the value -1 is returned. This method blocks until input data is available, the end of the stream is detected, or an exception is thrown.

Returns
int the next character of data, or -1 if the end of the stream is reached.

Throws
IOException if the pipe is broken, unconnected, closed, or an I/O error occurs.

read

Added in API level 1
public int read (char[] cbuf, 
                int off, 
                int len)

Reads up to len characters of data from this piped stream into an array of characters. Less than len characters will be read if the end of the data stream is reached or if len exceeds the pipe's buffer size. This method blocks until at least one character of input is available.

Parameters
cbuf char: the buffer into which the data is read.

off int: the start offset of the data.

len int: the maximum number of characters read.

Returns
int the total number of characters read into the buffer, or -1 if there is no more data because the end of the stream has been reached.

Throws
IOException if the pipe is broken, unconnected, closed, or an I/O error occurs.
IndexOutOfBoundsException

ready

Added in API level 1
public boolean ready ()

Tell whether this stream is ready to be read. A piped character stream is ready if the circular buffer is not empty.

Returns
boolean True if the next read() is guaranteed not to block for input, false otherwise. Note that returning false does not guarantee that the next read will block.

Throws
IOException if the pipe is broken, unconnected, or closed.